[r-t] Common Grandsire singles in Oxford Bob Triples

[List01]

Don Morrison said
>   "you can't use Grandsire Singles in a peal of Oxford Bob Triples"
>
> Can you get a true 10,080 using just the usual bob and Grandsire
> Singles, and including at least two such singles?


As Single Oxford is a pure triples method, is there any proof that a Bobs
only 5040 is not possible?

Chris Adams